<html>
    <head>
        <title>404 Not Found</title>
        <style>
            body {
                font-family: sans-serif;
                background-color: #f0f0f2;
                margin: 0;
                height: 100vh;
                display: flex;
                align-items: center;
                justify-content: center;
                color: #000;
            }
        </style>
    </head>
    <body>
        <div>
            <h1>404 Not Found</h1>
            <p>The page you are looking for does not exist.</p>
        </div>
    </body>
</html>